package cn.tedu._05weibo.base.interceptor;

import cn.tedu._05weibo.pojo.vo.UserVO;
import lombok.extern.slf4j.Slf4j;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

@Configuration
@Slf4j
public class LoginCheckInterceptor implements HandlerInterceptor {
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        log.debug("拦截器进行登录状态校验.........");
        HttpSession session = request.getSession();
        UserVO userVO =(UserVO) session.getAttribute("user");

        if(userVO!=null){
            return true;
        }
        response.sendRedirect("/login.html");
        return false;
        /*
        1.获取httpsession会话对象;
        2.通过会话对象获取用户标识【getAttribute("user")】;
        3.判断用户标识是否为null;
          3.1 如果不为null，登录状态没问题，放行return true;
          3.2 如果为null，未登录,，
               *重定向到登录页面;
               *return false;

         */

    }

    @Override
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {
        HandlerInterceptor.super.postHandle(request, response, handler, modelAndView);
    }

    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
        HandlerInterceptor.super.afterCompletion(request, response, handler, ex);
    }
}
